In case anybody is curious, some info about my own UniFi setup:
I decided to buy into UniFi just about a year ago, after downsizing from a house into a condo in a high-rise and realizing that the wifi gear I had was unsuited for the new environment. The 2.4GHz band is just about saturated here, and the 5GHz band is getting bad. I figured I needed to move my high-performance clients into 6GHz, which would have less competition for years yet, and also only very close neighbors could interfere at all. I'd been using Zyxel APs, but they didn't do 6GHz and Zyxel wasn't offering any attractive 6E solutions yet. I sprung for UniFi U6 Enterprise APs, which are pricy and really overkill for the number of wifi clients I have, but they were all that UniFi had at the time in 6E gear. I haven't regretted it --- they are solid, well-performing APs. I have three of 'em; I initially tried to cover my space with two, but had a dead spot in the middle and not a lot of flexibility to reposition the initial two. But with three I can run them at fairly low Tx power which is how this gear is meant to be used. I get very smooth roaming between them. All are wired, though I had to settle for a MoCA not ethernet link to one.
I've recently finished replacing all our high-performance clients (phones and laptops) with 6E-capable gear. I don't foresee replacing these devices for several years, by which time I'll probably want wifi 7 APs and clients -- and they'll be way cheaper and less temperamental than today. But for now, I'm happy as can be. I still can't see anyone else's 6GHz SSID in my scanner app, so I'm ahead of my nearest neighbors at least. All my low-performance clients behave well too, though I don't have a lot of junky IoT-grade gear that might cause trouble.
I'm using a cloud key for controller, because at the time the DIY-hosted app had a really bad reputation for dependency problems (it's apparently gotten better since then) and I figured I'd rather spend a few more bucks than tear my hair over sysadmin hoop-jumping. I do not have any other UniFi gear: I'm happy with my pfSense router and Cisco-and-Zyxel switches.